Method for treating and utilizing potassium hydrogen tartrate mother liquor
A technology of potassium hydrogen tartrate mother and potassium hydrogen tartrate, which is applied in the field of processing and utilizing potassium hydrogen tartrate mother liquor, can solve problems such as difficulty and waste of resources, and achieve the effect of reducing COD content and improving resource utilization
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Embodiment 1
[0015] Take 3 tons of process wastewater from the production of DL-potassium hydrogen tartrate, and concentrate it under reduced pressure through a thin-film evaporator to a relative density of 1.26 (determined by Pomei meter, the same below) to obtain 1 ton of concentrated liquid. Add catalyst (tungsten Sodium) 1kg, the temperature is controlled at 70-72 degrees Celsius, slowly add the concentration of 27.5% hydrogen peroxide 400kg, keep for 24 hours, after the reaction, the reaction solution is warmed to 95-100 ℃, kept for 2 hours, then cooled to room temperature, centrifuged to obtain a precipitate And recover the mother liquor, take the precipitate to obtain 300 kg of potassium hydrogen tartrate product with a purity of 95% (determined by titration with 0.5 mol / L sodium hydroxide solution).
[0016] The recovered mother liquor is recovered in the same way. For every 3 tons of secondary mother liquor, 260kg of product can be recovered, with a product purity of 85%.
Embodiment 2
[0018] Take 3 tons of process wastewater from the production of DL-potassium hydrogen tartrate, and concentrate it under reduced pressure through a thin film evaporator to a relative density of 1.26 to obtain 1.1 tons of concentrated liquid. Add 1.1 kg of catalyst (sodium tungstate) to the concentrated liquid and control the temperature at 70-72 degrees Celsius, slowly add 440kg of hydrogen peroxide with a concentration of 27.5%, keep it for 24 hours, after the reaction, the reaction solution is heated to 95-100°C for 2 hours, then cooled to room temperature, centrifuged, and the precipitate is taken to obtain 285kg of potassium hydrogen tartrate product. The purity is 95% (determined by titration with 0.5mol / L sodium hydroxide solution).
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